Update LiveDataTestUtil.kt

[al-zy-naf]

I think we should use catch instead of finally because finally is always executed.

Imagine when the LiveData value was set, the Observer.onChanged() method is triggered and removing the observer on this@getOrAwaitValue.removeObserver(this). So when we using finally, the Observer which we deleted earlier will be removed again which would be wasting.

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[al-zy-naf]

@googlebot I signed it!